A CABLE BOLT

Description

[0001] The present invention relates to cable bolts for use in the mining and construction industries to support the walls and roofs of underground excavations and openings and particularly, although not exclusively, to cable bolts for use in coal mining where the softer excavation material generally requires differing considerations to those in metalliferous mining.

[0002] In coal mines the cable bolt is normally fixed at the inner end of a hole drilled in the mine roof by means of a two part quick curing resin. The epoxy resin is inserted into the hole in separate packaged parts and pushed to the end of the hole by insertion of the cable bolt which also causes destruction of the packaging and mixing of the parts. Rotation of the bolt during full insertion ensures proper mixing of the resin which quickly cures to secure the top of the cable bolt in the hole. In some circumstances cement grouting is then pumped into the hole to secure the bolt along its entire length, to the sides of the hole.

[0003] One known form of cable bolt for coal mines is marketed under the name "Flexibolt"™ ("Flexibolt" is a registered trade mark of JJP Geotechnical Engineering Pty. Ltd.) and comprises a number of outer wires or strands wound around a central core of smaller diameter wires or strands in a helical fashion to form a bar which constitutes the main part of the cable bolt. The lower end of the bolt, that is, the end external of the hole in use, has a thread rolled into the surface of the bolt which, because of the irregular outer surface of the bolt, is a discontinuous thread only occurring in the outermost surface of each of the outer wires or strands. A nut having a thin metal plate pressed into one end is adapted to be wound on the thread until initially the plate bears on the end of the cable bolt and prevents further progress of the nut. Further rotation of the nut by a standard drive mechanism causes rotation of the entire cable bolt to thereby mix the two part resin until the resin cures, at which time the top end of the bolt is firmly anchored and further rotation of the nut causes the plate to be forced out of the nut and the nut to progress along the threaded end of the cable bolt. A bearing plate prearranged on the cable bolt and a conventional barrel and wedge between the bearing plate and nut are therefore forced upwardly by the further rotation of the nut against the roof of the mine until sufficient tension is applied to the cable bolt by the rotation of the nut. Whilst the aforementioned "Flexibolt"™ is used quite extensively there are some features thereof which render it less than ideal. Most significantly the combination of the nut, barrel and wedge, does not normally give an anchorage force equivalent to the strength of the cable bolt, as it would require a disproportionately long barrel and wedge which, apart from cost considerations would extend downwardly into the mine an unacceptable distance. Furthermore, it is not possible with the "Flexibolt"™ to provide additional bonding such as grouting over the remaining length of the bolt as there is no means for getting the grouting into the hole after the bearing plate and barrel and wedge are in position. Therefore, the "Flexibolt"™ must rely only on the bonding achieved by the resin which extends about two meters down from the top of the bolt and consequently full bonding is difficult to achieve. The nut and rolled thread combination is not capable of developing more than about 30% of the ultimate tensile strength (UTS) of the cable due to the noncontinuous thread and therefore the cable bolt cannot be pre-tensioned beyond about 30% of the UTS by rotation of the nut alone.

[0004] There are various disclosures in the patent literature relating to cable bolts for employment in supporting mine roof structures. US 5 525 013 relates to cable bolts employing a slightly modified barrel and wedge construction at the terminus of the cable. A threaded member of the cable bolt comprises a number of apertures each arranged to receive one of a number of cables comprising a plurality of wires or strands. Tapered jaws are arranged to be accommodated in the apertures such that the cables are clamped and fixed relative to the threaded member. The threaded member cooperates with a nut which bears against a bearing plate against a mine roof.

[0005] DE 3905128 discloses employing a barrel and wedge construction at the terminus of the cable. US 5531545 employs a variation of a barrel and wedge construction but still relies on a clamping action to fix the cable relative to a tubular member. GB 2309060 relates to a cable bolt having a rod member coupled to a flexible multi-strand cable. The coupling can employ a barrel and wedge construction but the connection may alternatively be made by swaging, adhesives, welding or combinations thereof.

[0006] US4798501 employs lamella which are terminated by a sleeve to which they are attached by press fitting, heat sealing or welding. GB 2309059 relates to a multi-strand cable having a head integrally formed on a first end. The head may be cast or forged onto the first end. A barrel and wedge assembly may also be attached onto the cable.

[0007] The present invention relates to an alternative construction not envisaged by the aforementioned literature.

[0008] It is an objection of this invention to provide a cable bolt for use in coal mines which overcomes one or more of the shortcomings of the "Flexbolt"™ or at least provide a useful alternative.

[0009] Accordingly, one broad form of the invention which may be preferred provides a cable bolt comprising a plurality of generally closely spaced elongate wires or strands, said wires or strands having a first end adapted for fitting into a bore hole and a second end being terminated within a cylindrical sleeve, said cylindrical sleeve having a threaded external surface to receive a lock nut for tightening against a bearing plate so as to tension said cable bolt, characterised in that the termination of said second end of wires or strands comprises a transverse plate having individual termination holes for each of said wires or strands and wherein said wires or strands pass through respective individual termination holes and said each wire or strand has an enlarged head which is larger than the diameter of said respective termination holes whereby said each wire or strand cannot be withdrawn from said respective individual termination holes.

[0010] Preferably said wires or strands are separated outwardly from a central longitudinal axis of the cable bolt at discrete spaced locations along the length of the cable bolt to provide a "bird cage" at each location.

[0011] In one more specific form of the invention the wires or strands are straight and parallel to the longitudinal axis between each bird cage and in an alternative form said wires or strands have a slight helical configuration over the length of the cable bolt.

[0012] Preferably, coupling means such as a drive nut suitable for engagement with an industry standard square or hexagonal drive is provided in the lower end of said sleeve for the purpose of rotating said cable bolt.

[0013] In one more specific form said lock nut has a connection for receiving a grout tube and said connection provides access to an annular chamber formed within said lock nut, said annular chamber being against said bearing plate and said bearing plate having a bore therethrough which is greater in diameter than the outer diameter of said sleeve whereby said annular chamber is open to a space between said cable bolt and a wall of a bore hole in the mine roof into which the cable bolt is inserted, whereby grout is pumped through said grout tube and enters said bore hole in the mine roof.

[0014] In an alternative more specific form of the invention said grout enters said annular chamber via said coupling means.

[0015] Preferably, located along the longitudinal axis of said cable bolt is a central elongate tubular member which may be hollow and which extends over a substantial length of said cable bolt to act as an air bleed tube when grout is pumped into said bore hole, said tube extending through said sleeve and coupling means.

[0016] Preferably, a resin seal is provided on said cable bolt at a spaced location from said first end of said wires or strands to prevent resin, used to bond the first end of said wires or strands to the wall of the bore hole, from passing downwardly below said seal, said resin seal comprising a sleeve that fits over said wires or strands and said elongate tubular member terminating within said resin seal.

[0017] Preferably, spacers are provided at spaced locations around said elongate tubular member to cause said wires or strands to spread outwardly and form said bird cages.

[0018] Another preferred form of the invention provides a cable bolt for use in an excavation comprising a plurality of generally closely spaced elongate wires or strands having a first end adapted for fitting into a bore hole formed in said excavation and a second end adapted for bearing against the excavation surface wherein the terminal region of said second end of said wires or strands terminates in a cylindrical sleeve having a threaded external surface adapted to cooperate with a threaded lock nut for tightening said cable bolt against said excavation, and wherein said termination of said second end of said wires or strands comprises a transverse plate in said cylindrical sleeve, said transverse plate having individual holes for each wire or strand and each wire or strand passes through a respective termination hole and has an enlarged head which is larger than the diameter of the termination hole whereby the wire or strand cannot be withdrawn from the said respective termination holes.

[0019] In order that the invention may be more readily understood reference should be made to the accompanying drawings wherein;

Figure 1 is a front elevation of a cable bolt according to a first embodiment of the invention;

Figure 2 is an enlarged view of a portion of the cable bolt shown in Figure 1;

Figure 3 is a front elevation of a cable bolt according to a second embodiment of the invention;

Figure 4 is an enlarged view of a portion of the cable bolt shown in Figure 3;

Figure 5 is an enlarged view of a portion at the top end of the cable bolt of Figures 1 and 2; and

Figure 6 is an enlarged view of a portion of the top end of an alternative cable bolt.

[0020] The cable bolt 10 consists essentially of a number of wires or strands 11 extending over the length of the cable bolt and spaced around a central member 12 (Figures 2, 4) which is preferably elongate and tubular. The central member 12 is a hollow metal or plastics tube in this embodiment but in situations where the cable bolt is not to be grouted after installation, the central member 12 may merely comprise a further wire similar to the wires or strands 11 but arranged centrally along the longitudinal axis of the cable bolt 10.

[0021] In the embodiments of Figures 1 to 5, the strands 11 are essentially straight and parallel with the central strand 12 except for points along the length of the cable bolt where the strands are flared outwardly to form a "bird cage". For the purpose of forming each "bird cage" 13, a spacer 14 in the form of a nut or annular ring (see FIGURE 5) is provided around the central member 12 and the strands 11 are caused to bow out over the spacer 14 thus providing the "bird cage" 13. The bird cage 13 exposes a greater surface area of each of the strands 11 to provide increased bonding for the resin and additionally for grout, where it is used. Spaced collars 15 at either side of each "bird cage" clamp the wires back together against the central strand 12.

[0022] The strands 11 are terminated at a first end 44, in use, by a terminal collar 16 which is welded to the strands 11 or alternatively the strands 11 may be merely welded together at the first end 44.

[0023] A second end (not shown) of the wires or strands 11 enter a cylindrical sleeve 17 in which the second end is terminated. The second end termination of the wires or strands 11 consists of a transverse plate in the sleeve 17 having individual holes for each strand 11. Each strand 11 passes through a respective hole and is provided with an enlarged head in the form of a button end which is larger than the diameter of each respective hole thereby preventing withdrawal of the strands 11 from the sleeve 17. As shown in FIGURE 1 the sleeve 17 is threaded on its outer surface to receive lock nut 18 which is shown in more detail in FIGURE 2. The lock nut 18 is tightened in use against bearing plate 19 to tension the cable bolt 10 to provide the required tension for supporting the roof of a mine.

[0024] The bearing plate 19 is provided with a "trumpet" 20 which is welded to the bearing plate 19 and consists of a stepped cylindrical tube adapted to extend a short distance into the bore hole 21 which is drilled in the mine roof for accommodating the cable bolt. Collar pipes 22 and 23 extend concentrically from the sleeve 17 by means of the collar pipe 22 being inserted into the end of the sleeve 17 and the collar pipe 23 being inserted in the end of the collar pipe 22. The purpose of these collar pipes 22 and 23 is to provide stiffening to the lower end of the cable bolt when required. In an alternative embodiment only a single collar pipe with expanded section is used.

[0025] As is shown in FIGURE 2, the lock nut 18 has a bore 24 in the side of the nut which extends radially inwardly to an annular chamber 25 provided in the upper end of the nut 18. The bearing plate 19 has a hole through which the sleeve 17 of the cable bolt passes and the hole in the bearing plate has clearance around the sleeve. Thus there is a passage from the annular chamber 25 through the bearing plate 19 and into a space which exists between the trumpet 20 and the sleeve 17. A grout tube 26 is connected to the bore 24 by means of a suitable connection. Thus, grouting, which is typically in the form of "liquid" grout, pumped into the grout tube 26 enters the annular chamber 25 and passes up through the trumpet 20 and into the bore hole 21 accommodating the cable bolt 10. In another form the grout may enter via coupling means such as a drive nut 27 which is fixed into the end of the sleeve 17 and is of a size that will be readily engageable with a industry standard hexagonal or square drive for the purpose of rotating the cable bolt during insertion into the bore hole. Alternatively a screw coupler or any other coupling means that is engageable to sleeve 17 may be used.

[0026] A trumpet seal 30 in the form of either foam or an "O" ring is adapted to fit around the trumpet 20 immediately above either of the stepped sections 28 or 31 for the purpose of sealing the cable bolt against the side of the bore hole. The trumpet seal 30 assists in centering the trumpet 20 and sleeve 17 within the bore 21 to prevent damage to the external thread of sleeve 17 against the surface walls formed by the bore 21. A further seal in the form of a tapered tubular resin seal 29 is provided over the strands of the cable bolt at a location spaced about 2 meters from the first end 44 of the wires or strands 11. In the case wherein the central member 12 is a hollow metal or plastics tube, it terminates at an upper end 45 within the resin seal 29 as is shown in FIGURE 2.

[0027] In the second embodiment shown in Figures 3 and 4, the locking nut 18 is substantially thinner in width and does not have an annular chamber compared with the embodiment of Figures 1 and 2, to enable the substantially thinner nut 18 to have the required strength. For situations where grouting is required, the grout is pumped into grout tube 26 (Figure 4) which is connected to coupling means such as a drive nut 27 by suitable connection means and is in communication with a bore 33. As an alternative to using drive nut 27, a screw coupler or any coupling device that is welded, press-fitted into sleeve 17 may be used. The screw coupler may be threaded with limited depth so that when it is screwed onto the lower end of sleeve 17, it will eventually lock so that further rotation of the coupler will result in rotation of the cable bolt 10. The bore 33 opens up into an annular cavity 34 surrounding the central member 12 in the drive nut 27. The drive nut 27 is externally threaded at its upper end and engages a corresponding internal thread of sleeve 17. The annular cavity 34 extends upwardly through sleeve 17, locking nut 18, bearing plate 19 into a space 35 between trumpet 20 and collar pipe 23. The grout fills the annular cavity 34 and space 35 until it is expelled from the top portion 46 of trumpet 20 and fills the bore hole 21. The trumpet seal 30 prevents any grout flowing downwardly past the seal itself so that with continued pumping the bore 21 will fill until it reaches the upper end termination 45 of the central member 12 in resin seal 29. During the process, air is bled out from the bore hole 21 and is forced out down the interior of hollow central member 12 until it is expelled from the lower end 36 thereof. The grout follows downwardly through the central member 12 so that when it exits the lower end 36 it provides an indication that the grouting process is complete. A cap 37 may be screwed onto end 36 to prevent any further egress of the grout.

[0028] There may exist a number of cracks or channels in the mine walls or roof that meet at various openings to the bore hole 21. It is possible that grout being pumped into the bore hole 21 will fill up these channels with the result that the grout does not reach the resin seal 29 and enter the central member 12. There will therefore be no indication of the grout covering a substantial length of the cable bolt 10 up to the resin seal 29. To overcome this, an option to the user is to have the grout pumped in a reverse manner, that is, pumping the grout up the central member 12 first and letting the grout fill up the space between the cable bolt 10 and the walls 32 of the bore hole 21. To facilitate this, the grout tube 26 is directly connected (not shown) to a lower part of central member 12 so that it is in communication with the central member 12. Grout, which in this application is typically thixotropic, is then pumped into the central member 12 until it fills whereupon further pumping forces grout to flow out of the upper end 45 of central member 12 in resin seal 29 and then substantially fills up the bore hole 21. The seal 30 and/or an additional seal 38 prevent the grout from exuding outwardly of the hole 21 past the bearing plate 19. The air originally existing in the bore hole 21 is expelled through the channels or cracks if they exist.

[0029] In use, the cable bolt is installed in the roof of a mine by firstly drilling a stepped bore hole 21 in the mine roof to the required length. Next, a two part resin adhesive in separate plastic packs 39, 40 and 41 is placed in the hole and is pushed upwardly to the top of the hole by insertion of the cable bolt 10. When the resin has reached the inner end 42 of the hole further insertion of the cable bolt fractures the packaging and the two parts of the resin are allowed to mix. Rotation of the cable bolt 10 by means of applying driving dolly 43 to the drive nut 27 causes further mixing of the resin which extends from the first end 44 of the wires or strands 11 of the cable bolt to the resin seal 29. The resin is quick curing and once cured further rotation of the cable bolt is prevented. Thus, the cable bolt is then secured in the bore hole 21 at the upper end 42 and the lock nut 18 is tightened to force the bearing plate 19 against the mine roof. Once the required tension in the cable bolt has been reached, the mine roof is secured. If the cable bolt is to be grouted over its entire length, grouting is pumped via the grout tube 26 until it fills the bore hole and all the spaces surrounding the strands 11 up to the resin seal 29. During the first application of this process where the grout is first pumped through annular cavity 34, air is bled from the bore hole via the hollow central tube 12 and since this central tube 12 extends outwardly through the drive nut 27 at the bottom of the cable bolt, evidence that grouting has been completed occurs when the grouting appears at the bottom of the central member 12. Installation is then complete.

[0030] As indicated previously, in an alternative embodiment where the cable bolt is not to be grouted into the hole, the central hollow tube 12 may be replaced by a solid wire or strand.

[0031] FIGURE 4 shows an alternative form of the cable bolt where the strands 11 assume a helical path around a central strand which is not evident in the FIGURE. The degree of helical twisting of the strands is relatively slight.

[0032] It should be evident from the description hereinabove that the cable bolt of the present invention provides advantages over existing cable bolts. For example, the cylindrical sleeve 17 provides continuous thread for the lock nut 18 and because of its larger diameter, it is able to withstand much higher forces than previous lock nuts and therefore it is possible to have a bottom end termination which can withstand forces equal to or greater than the minimum tensile capacity of the cable bolt. Whilst it necessitates the reaming of a larger diameter portion at the bottom of the bore hole 21, this is not a detrimental requirement. Furthermore, by providing in one application an air bleed tube along the central axis of the cable bolt, it achieves the two purposes of providing means for supporting the spacers 14 as well as means for allowing air to be discharged from the bore hole 21.

Claims

1. A cable bolt (10) comprising a plurality of generally closely spaced elongate wires or strands (11), said wires or strands (11) having a first end (44) adapted for fitting into a bore hole and a second end being terminated within a cylindrical sleeve (17), said cylindrical sleeve having a threaded external surface to receive a lock nut (18) for tightening against a bearing plate (19) so as to tension said cable bolt (10), characterised in that the termination of said second end of wires or strands (11) comprises a transverse plate having individual termination holes for each of said wires or strands (11) and wherein said wires or strands (11) pass through respective individual termination holes and said each wire or strand (11) has an enlarged head which is larger than the diameter of said respective termination holes whereby said each wire or strand (11) cannot be withdrawn from said respective individual termination holes.

2. A cable bolt (10) according to claim 1 wherein said wires or strands (11) are separated outwardly from a central longitudinal axis of said cable bolt (10) at discrete spaced locations along the length of said cable bolt (10) to provide a bird-cage shaped structure (13) at each location.

3. A cable bolt (10) according to claim 2 wherein a plurality of spacers (14) are provided at said discrete spaced locations to cause said wires or strands (11) to spread outwardly and form said bird-cage shaped structure (13) .

4. A cable bolt (10) according to claim 3 wherein a central elongate tubular member (12) extends along said central longitudinal axis through said cylindrical sleeve (17) and through said spacers (14) whereby each of said spacers (14) has an aperture through which said tubular member (12) passes.

5. A cable bolt (10) according to claim 4 having a resin seal (29) provided at a spaced location from said first end (44) of said wires or strands (11), said resin seal (29) preventing resin from passing downwardly below said resin seal, said resin being used to bond said first end (44) to a wall of said bore hole formed prior to inserting said cable bolt (10).

6. A cable bolt (10) according to claim 5 wherein said resin seal (29) comprises a second sleeve that fits over said wires or strands (11).

7. A cable bolt (10) according to claim 6 wherein said central elongate tubular member (12) is hollow and terminates at an upper end in said resin seal (29).

8. A cable bolt (10) according to claim 7 wherein said lock nut (18) has a connection for receiving a grout tube (26), said connection providing access to an annular chamber formed within said lock nut (18).

9. A cable bolt (10) according to claim 8 wherein said annular chamber, in use, bears against said bearing plate (19) .

10. A cable bolt (10) according to claim 9 wherein said bearing plate (19) has a bore therethrough which is greater in diameter than the outer diameter of said cylindrical sleeve (17) whereby said annular chamber is open to a space between said cable bolt (10) and said wall of said bore hole, whereby grout is pumped through said grout tube (26) and enters said bore hole.

11. A cable bolt (10) according to claim 10 wherein said elongate tubular member (12) provides an air bleed to remove air from said bore hole when grout is being pumped into said bore hole.

12. A cable bolt (10) according to claim 2 wherein said wires or strands (11) are straight and parallel to said central longitudinal axis between each bird-cage shaped structure (13).

13. A cable bolt (10) according to any preceding claim having coupling means adapted to fit a lower end of said cylindrical sleeve (17) for rotating said cable bolt (10).

14. A cable bolt (10) according to claim 13, wherein said coupling means has an external portion which is threaded and adapted to engage an internal thread of said cylindrical sleeve (17) such that upon such engagement and rotation of said coupling means a position of said coupling means is reached where further rotation results in rotation of said cable bolt (10).

15. A cable bolt (10) according to claim 1 wherein said wires or strands (11) have a slight helical configuration over the length of said cable bolt (10).

16. A cable bolt (10) according to claim 1 and further comprising coupling means adapted to fit a lower end of said cylindrical sleeve (17) for the purpose of rotating said cable bolt (10), said coupling means including an external portion which is threaded and adapted to engage an internal thread of said cylindrical sleeve (17) such that upon such engagement and rotation of said coupling means a position of said coupling means is reached where further rotation results in rotation of said cable bolt (10), wherein said coupling means has a connection for receiving a grout tube (26), said coupling means connection providing access to an annular cavity formed within said coupling means and surrounding a hollow central tubular member (12).

17. A cable bolt (10) according to claim 16 wherein said annular cavity extends through said cylindrical sleeve (17) and said bearing plate (19), said bearing plate (19) having a bore therethrough which is greater in diameter than the outer diameter of said cylindrical sleeve (17), said annular cavity being open to a space between said cable bolt (10) and said wall of said bore hole, whereby grout is pumped through said grout tube (26) and enters said bore hole.

18. A cable bolt (10) according to claim 17 wherein said hollow tubular member (12) acts as an air bleed to remove air from said bore hole when grout is being pumped into said bore hole.

19. A cable bolt (10) according to any preceding claim wherein said bearing plate (19) has a trumpet-shaped member (20) welded thereto, said trumpet-shaped member (20) comprising a stepped cylindrical tube and adapted to extend a short distance into said bore hole.

20. A cable bolt (10) according to claim 19 further including one or more collar pipes adapted to be inserted into an upper end of said cylindrical sleeve (17) so as to provide stiffening to said first end (44) of said wires or strands (11).

21. A cable bolt (10) according to claim 1 wherein the cable bolt (10) is adapted for use in an excavation and the first end (44) of said wires or strands (11) is adapted for fitting into a bore hole formed in said excavation and the second end is adapted for bearing against the excavation surface, wherein the terminal region of said second end of said wires or strands (11) terminates in said cylindrical sleeve (17) having a threaded external surface adapted to cooperate with said threaded lock nut (18) for tightening said cable bolt (10) against said excavation.

22. A cable bolt (10) according to claim 13, when dependent on claim 7, wherein said coupling means has an external portion which is threaded and adapted to engage an internal thread of said cylindrical sleeve (17) such that upon such engagement and rotation of said coupling means a position of said coupling means is reached where further rotation results in rotation of said cable bolt (10), wherein said coupling means has a connection for receiving a grout tube (26) and connecting said grout tube (26) to said hollow central tubular member (12) such that grout is pumped through said grout tube (26) and enters said hollow central tubular member (12).

23. A cable bolt (10) according to claim 22 wherein said grout after filling said hollow central tubular member (12) exits said member and enters said bore hole.

Ansprüche

1. Seilbefestigungsbolzen (10), der mehrere im wesentlichen eng nebeneinander angeordnete langgestreckte Drähte oder Seile (11) aufweist, wobei die Drähte oder Seile (11) ein erstes Ende (44) aufweisen, das in eine Bohrung einführbar ist, und ein zweites Ende aufweisen, das in einer zylindrischen Hülse (17) endet, wobei die genannte zylindrische Hülse eine mit einem Gewinde versehene Außenfläche aufweist, um eine Befestigungsmutter (18) zum Befestigen an einer Lagerplatte (19) aufzunehmen, so dass der genannte Seilbefestigungsbolzen (10) gespannt wird, dadurch gekennzeichnet, dass der Abschlussbereich des genannten zweiten Endes der Drähte oder Seile (11) eine Querplatte aufweist, die einzelne Abschlussbohrungen für jeden der Drähte oder jedes der Seile (11) aufweist, wobei die genannten Drähte oder Seile (11) sich durch die entsprechenden einzelnen Abschlussbohrungen hindurch erstrecken und jeder der genannten Drähte oder jedes der genannten Seile (11) einen vergrößerten Kopf aufweist, der größer als der Durchmesser der genannten entsprechenden Abschlussbohrungen ist, so dass jeder der genannten Drähte oder jedes der genannten Seile (11) aus den genannten entsprechenden einzelnen Abschlussbohrungen nicht herausgezogen werden kann.

2. Seilbefestigungsbolzen (10) nach Anspruch 1, dadurch gekennzeichnet, dass an diskret beabstandeten Stellen entlang des genannten Seilbefestigungsbolzens (10) die genannten Drähte oder Seile (11) von einer zentralen Längsachse des genannten Seilbefestigungsbolzens (10) nach außen voneinander getrennt sind, um an jeder Stelle eine vogelkäfigförmige Struktur (13) vorzusehen.

3. Seilbefestigungsbolzen (10) nach Anspruch 2, dadurch gekennzeichnet, dass mehrere Abstandshalter (14) an den genannten diskret beabstandeten Stellen vorgesehen sind, um die genannten Drähte oder Seile (11) nach außen zu verteilen und die genannte vogelkäfigförmige Struktur (13) zu bilden.

4. Seilbefestigungsbolzen (10) nach Anspruch 3, dadurch gekennzeichnet, dass ein zentrales, langgestrecktes, rohrförmiges Teil (12) sich entlang der genannten zentralen Längsachse durch die genannte zylindrische Hülse (17) und die genannten Abstandshalter (14) hindurch erstreckt, wobei jeder der genannten Abstandshalter (14) eine öffnung aufweist, durch die das genannte rohrförmige Teil (12) verläuft.

5. Seilbefestigungsbolzen (10) nach Anspruch 4, dadurch gekennzeichnet, dass im Abstand vom genannten ersten Ende (44) der genannten Drähte oder Seile (11) eine Kunstharzdichtung (29) vorgesehen ist, wobei die genannte Kunstharzdichtung (29) ein Herunterlaufen des Harzes unter die genannte Kunstharzdichtung verhindert und wobei das Harz zum Verkleben des genannten ersten Endes (44) mit einer Wand der genannten Bohrung verwendet wird, die vor dem Einführen des genannten Seilbefestigungsbolzens (10) gebildet wird.

6. Seilbefestigungsbolzen (10) nach Anspruch 5, dadurch gekennzeichnet, dass die genannte Kunstharzdichtung (29) eine zweite Hülse aufweist, die über die genannten Drähte oder Seile (11) gestülpt ist.

7. Seilbefestigungsbolzen (10) nach Anspruch 6, dadurch gekennzeichnet, dass das zentrale, langgestreckte, rohrförmige Teil (12) hohl ist und an einem oberen Ende in der genannten Kunstharzdichtung (29) endet.

8. Seilbefestigungsbolzen (10) nach Anspruch 7, dadurch gekennzeichnet, dass die Befestigungsmutter (18) einen Anschluss zur Aufnahme eines Einspritzrohrs (26) aufweist, wobei der Anschluss einen Zugang zu einer ringförmigen Kammer ermöglicht, die in der genannten Befestigungsmutter (18) ausgebildet ist.

9. Seilbefestigungsbolzen (10) nach Anspruch 8, dadurch gekennzeichnet, dass die genannte ringförmige Kammer im Betrieb an der Lagerplatte (19) anliegt.

10. Seilbefestigungsbolzen (10) nach Anspruch 9, dadurch gekennzeichnet, dass die Lagerplatte (19) eine durchgehende Bohrung aufweist, deren Durchmesser größer als der Außendurchmesser der zylindrischen Hülse (17) ist, wobei die genannte ringförmige Kammer zu einem Raum zwischen dem genannten Seilbefestigungsbolzen (10) und der genannten wand der genannten Bohrung hin offen ist und wobei Vergussmaterial durch das Einspritzrohr (26) gepumpt wird und in die genannte Bohrung eintritt.

11. Seilbefestigungsbolzen (10) nach Anspruch 10, dadurch gekennzeichnet, dass das genannte langgestreckte, rohrförmige Teil (12) eine Entlüftung zum Entfernen von Luft aus der genannten Bohrung bildet, wenn das Vergussmaterial in die Bohrung gepumpt wird.

12. Seilbefestigungsbolzen (10) nach Anspruch 2, dadurch gekennzeichnet, dass zwischen jeder vogelkäfigförmigen Struktur (13) die genannten Drähte oder Seile (11) gerade und parallel zur zentralen Längsachse verlaufen.

13. Seilbefestigungsbolzen (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass dieser ein Kupplungsmittel hat, das einpassbar in das untere Ende der genannten zylindrischen Hülse (17) ist, um den genannten Seilbefestigungsbolzens (10) zu verdrehen.

14. Seilbefestigungsbolzen (10) nach Anspruch 13, dadurch gekennzeichnet, dass das genannte Kupplungsmittel einen äußeren Abschnitt aufweist, der mit einem Gewinde versehen ist und derart eingerichtet ist, dass er mit einem Innengewinde der zylindrischen Hülse (17) derart in Eingriff gelangt, dass bei einem solchen Ineingriffbringen und einem Verdrehen des genannten Kupplungsmittels eine Position des genannten Kupplungsmittels erreicht wird, in der aus einem weiteren verdrehen ein Verdrehen des genannten Seilbefestigungsbolzens (10) resultiert.

15. Seilbefestigungsbolzen (10) nach Anspruch 1, dadurch gekennzeichnet, dass die genannten Drähte oder Seile (11) über der Länge des genannten Seilbefestigungsbolzens (10) eine leicht spiralförmige Konfiguration aufweisen.

16. Seilbefestigungsbolzen (10) nach Anspruch 1, der weiterhin ein Kupplungsmittel aufweist, das in das untere Ende der genannten zylindrischen Hülse (17) zum Zweck des Verdrehens des genannten Seilbefestigungsbolzens (10) einpassbar ist, wobei das genannte Kupplungsmittel einen äußeren Abschnitt aufweist, der mit einem Gewinde versehen ist und derart eingerichtet ist, dass er mit einem Innengewinde der zylindrischen Hülse (17) derart in Eingriff gelangt, dass bei einem solchen Ineingriffbringen und einem Verdrehen des genannten Kupplungsmittels eine Position des genannten Kupplungsmittels erreicht wird, in der aus einem weiteren Verdrehen ein Verdrehen des genannten Seilbefestigungsbolzens (10) resultiert, dadurch gekennzeichnet, dass das Kupplungsmittel einen Anschluss zur Aufnahme eines Einspritzrohrs (26) aufweist, wobei der Anschluss des Kupplungsmittels einen Zugang zu einem ringförmigen Hohlraum ermöglicht, der in dem genannten Kupplungsmittel ausgebildet ist und ein hohles zentrales rohrförmiges Teil (12) umgibt.

17. Seilbefestigungsbolzen (10) nach Anspruch 16, dadurch gekennzeichnet, dass der ringförmige Hohlraum sich durch die genannte zylindrische Hülse (17) und die genannte Lagerplatte (19) hindurch erstreckt, wobei die Lagerplatte (19) eine durchgehende Bohrung aufweist, deren Durchmesser größer als der Außendurchmesser der zylindrischen Hülse (17) ist, und wobei der genannte ringförmige Hohlraum zu einem Raum zwischen dem genannten Seilbefestigungsbolzen (10) und der genannten Wand der genannten Bohrung hin offen ist, wobei Vergussmaterial durch das Einspritzrohr (26) gepumpt wird und in die genannte Bohrung eintritt.

18. Seilbefestigungsbolzen (10) nach Anspruch 17, dadurch gekennzeichnet, dass das hohle ringförmige Teil (12) als eine Entlüftung wirkt, um Luft aus der genannten Bohrung zu entfernen, wenn das vergussmaterial in die genannte Bohrung gepumpt wird.

19. Seilbefestigungsbolzen (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Lagerplatte (19) ein mit ihr verschweißtes, trompetenförmiges Teil (20) aufweist, wobei das trompetenförmige Teil (20) ein gestuftes zylindrisches Rohr aufweist und so eingerichtet ist, um sich über eine kurze Distanz in die genannte Bohrung hineinzuerstrecken.

20. Seilbefestigungsbolzen (10) nach Anspruch 19, wobei der Seilbefestigungsbolzen (10) weiterhin ein oder mehrere Bundrohre aufweist, die so eingerichtet sind, dass sie in ein oberes Ende der genannten zylindrischen Hülse (17) eingeführt werden können, um das genannte erste Ende (44) der genannten Drähte oder Seile (11) zu versteifen.

21. Seilbefestigungsbolzen (10) nach Anspruch 19, dadurch gekennzeichnet, dass der Seilbefestigungsbolzen (10) so eingerichtet ist, dass er in einer Ausschachtung verwendet werden kann und das erste Ende der Drähte oder Seile (11) so eingerichtet ist, dass es in eine in der Ausschachtung ausgebildete Bohrung eingelegt werden kann und das zweite Ende so eingerichtet ist, dass es an die Ausschachtungsoberfläche angelegt werden kann, wobei der Endbereich des zweiten Endes der genannten Drähte oder Seile (11) in der zylindrischen Hülse (17) endet, die eine mit einem Gewinde versehene Außenfläche aufweist, die so eingerichtet ist, dass sie mit der mit einem Gewinde versehenen Befestigungsmutter (18) zusammenwirkt, um den genannten Seilbefestigungsbolzen (10) gegen die genannte Ausschachtung festzuziehen.

22. Seilbefestigungsbolzen (10) nach Anspruch 13, wenn er vom Anspruch 7 abhängig ist, dadurch gekennzeichnet, dass das genannte Kupplungsmittel einen äußeren Abschnitt aufweist, der mit einem Gewinde versehen ist und so eingerichtet ist, dass er mit einem Innengewinde der zylindrischen Hülse (17) derart in Eingriff gelangt, dass bei einem solchen Ineingriffbringen und einem Verdrehen des genannten Kupplungsmittels eine Position des genannten Kupplungsmittels erreicht wird, in der aus einem weiteren Verdrehen ein Verdrehen des genannten Seilbefestigungsbolzens (10) resultiert, wobei das genannte Kupplungsmittel einen Anschluss zur Aufnahme eines Einspritzrohrs (26) und zum verbinden des genannten Einspritzrohrs (26) mit dem genannten hohlen, zentralen, rohrförmigen Teil (12) aufweist, derart, dass Vergussmaterial durch das genannte Einspritzrohr (26) gepumpt wird und in das genannte hohle, zentrale, rohrförmige Teil (12) eintritt.

23. Seilbefestigungsbolzen (10) nach Anspruch 22, dadurch gekennzeichnet, dass das genannte Vergussmaterial nach dem Füllen des hohlen, zentralen, rohrförmigen Teils (12) aus diesem genannten Teil austritt und in die genannte Bohrung eintritt.

Revendications

1. Boulon serre-câble (10) comprenant une pluralité de fils métalliques ou brins (11) allongés, généralement étroitement espacés, lesdits fils métalliques ou brins (11) ayant une première extrémité (44) adaptée à s'ajuster dans un trou de sondage et une seconde extrémité se terminant à l'intérieur d'un manchon cylindrique (17), ledit manchon cylindrique ayant une surface externe filetée pour recevoir un écrou de blocage (18) se serrant contre une plaque d'appui (19) de manière à mettre sous tension ledit boulon serre-câble (10), caractérisé en ce que la terminaison de ladite seconde extrémité des fils métalliques ou brins (11) comprend une plaque transversale ayant des trous individuels de terminaison pour chacun desdits fils métalliques ou brins (11), lesdits fils métalliques ou brins (11) passant au travers des trous individuels de terminaison respectifs et chacun desdits fils métalliques ou brins (11) ayant une tête élargie plus grande que le diamètre desdits trous de terminaison respectifs, grâce à quoi chacun desdits fils métalliques ou brins (11) ne peut être retiré desdits trous individuels de terminaison respectifs.

2. Boulon serre-câble (10) selon la revendication 1, dans lequel lesdits fils métalliques ou brins (11) sont séparés vers l'extérieur depuis un axe longitudinal central dudit boulon serre-câble (10) en des emplacements discrets, espacés le long de la longueur dudit boulon serre-câble (10) pour réaliser, au niveau de chaque emplacement, une structure (13) conformée en cage à oiseaux.

3. Boulon serre-câble (10) selon la revendication 2, dans lequel une pluralité d'espaceurs (14) est fournie auxdits emplacements discrets espacés de telle sorte que lesdits fils métalliques ou brins (11) se déploient vers l'extérieur et forment ladite structure (13) conformée en cage à oiseaux.

4. Boulon serre-câble (10) selon la revendication 3, dans lequel un élément tubulaire (12) allongé, central, s'étend le long dudit axe longitudinal, central, au travers dudit manchon cylindrique (17) et au travers desdits espaceurs (14), grâce à quoi chacun desdits espaceurs (14) a une ouverture au travers de laquelle passe ledit élément tubulaire (12).

5. Boulon serre-câble (10) selon la revendication 4, ayant un joint à résine (29) fourni en un emplacement espacé depuis ladite première extrémité (44) desdits fils métalliques ou brins (11), ledit joint à résine (29) empêchant de la résine de passer vers le bas en dessous dudit joint à résine, ladite résine étant utilisée pour lier ladite première extrémité (44) à une paroi dudit trou de sondage formé avant d'insérer ledit boulon serre-câble (10).

6. Boulon serre-câble (10) selon la revendication 5, dans lequel ledit joint à résine (29) comprend un second manchon qui s'adapte sur lesdits fils métalliques ou brins (11).

7. Boulon serre-câble (10) selon la revendication 6, dans lequel ledit élément tubulaire (12) allongé, central, est creux et se termine à une extrémité supérieure dans ledit joint à résine (29).

8. Boulon serre-câble (10) selon la revendication 7, dans lequel ledit écrou de blocage (18) a un raccordement pour recevoir un tube à coulis au ciment (26), ledit raccordement fournissant un accès à une chambre annulaire formée à l'intérieur dudit écrou de blocage (18).

9. Boulon serre-câble (10) selon la revendication 8, dans lequel ladite chambre annulaire s'appuie, en service, contre ladite plaque d'appui (19).

10. Boulon serre-câble (10) selon la revendication 9, dans lequel ladite plaque d'appui (19) a un alésage traversant, plus grand en diamètre que le diamètre externe dudit manchon cylindrique (17), grâce à quoi ladite chambre annulaire est ouverte sur un espace entre ledit boulon serre-câble (10) et ladite paroi dudit trou de sondage, grâce à quoi du coulis au ciment est pompé au travers dudit tube à coulis au ciment (26) et pénètre dans ledit trou de sondage.

11. Boulon serre-câble (10) selon la revendication 10, dans lequel ledit élément tubulaire allongé (12) réalise une purge d'air pour éliminer l'air dudit trou de sondage quand le coulis au ciment est en cours de pompage jusque dans ledit trou de sondage.

12. Boulon serre-câble (10) selon la revendication 2, dans lequel lesdits fils métalliques ou brins (11) sont droits et parallèles audit axe longitudinal, central, entre chaque structure (13) conformée en cage à oiseaux.

13. Boulon serre-câble (10) selon l'une quelconque des revendications précédentes, ayant un moyen d'accouplement adapté à s'ajuster à une extrémité inférieure dudit manchon cylindrique (17) pour mettre en rotation ledit boulon serre-câble (10).

14. Boulon serre-câble (10) selon la revendication 13, dans lequel ledit moyen d'accouplement a une portion externe filetée et adaptée à venir en prise avec un filetage interne dudit manchon cylindrique (17) de telle sorte que, par une telle venue en prise et une telle rotation dudit moyen d'accouplement, on atteint une position dudit moyen d'accouplement telle qu'une rotation supplémentaire a pour résultat la rotation dudit boulon serre-câble (10).

15. Boulon serre-câble (10) selon la revendication 1, dans lequel lesdits fils métalliques ou brins (11) ont une configuration légèrement hélicoïdale sur la longueur dudit boulon serre-câble (10).

16. Boulon serre-câble (10) selon la revendication 1, comprenant, en outre, un moyen d'accouplement adapté à s'ajuster à une extrémité inférieure dudit manchon cylindrique (17) dans le but de faire tourner ledit boulon serre-câble (10), ledit moyen d'accouplement incluant une portion externe filetée et adaptée à venir en prise avec un filetage interne dudit manchon cylindrique (17) de telle sorte que, par une telle venue en prise et une telle rotation dudit moyen d'accouplement, on atteint une position dudit moyen d'accouplement telle qu'une rotation supplémentaire a pour résultat une rotation dudit boulon serre-câble (10), ledit moyen d'accouplement ayant un raccordement pour recevoir un tube à coulis au ciment (26), ledit raccordement du moyen d'accouplement fournissant un accès à une cavité annulaire formée à l'intérieur dudit moyen d'accouplement et entourant un élément tubulaire (12) central, creux.

17. Boulon serre-câble (10) selon la revendication 16, dans lequel ladite cavité annulaire s'étend au travers dudit manchon cylindrique (17) et de ladite plaque d'appui (19), ladite plaque d'appui (19) ayant un alésage traversant, supérieur en diamètre au diamètre externe dudit manchon cylindrique (17), ladite cavité annulaire étant ouverte sur un espace entre ledit boulon serre-câble (10) et ladite paroi dudit trou de sondage, grâce à quoi le coulis au ciment est pompé au travers dudit tube à coulis au ciment (26) et pénètre dans ledit trou de sondage.

18. Boulon serre-câble (10) selon la revendication 17, dans lequel ledit élément tubulaire creux (12) agit comme une purge d'air pour éliminer l'air dudit trou de sondage quand du coulis au ciment est en cours de pompage jusque dans ledit trou de sondage.

19. Boulon serre-câble (10) selon l'une quelconque des revendications précédentes, dans lequel ladite plaque d'appui (19) a un élément conformé en trompette (20) soudé à elle, ledit élément conformé en trompette (20) comprenant un tube cylindrique étagé et adapté à s'étendre sur une courte distance à l'intérieur dudit trou de sondage.

20. Boulon serre-câble (10) selon la revendication 19, incluant, en outre, une ou plusieurs conduites à collet adaptées à être insérées à l'intérieur d'une extrémité supérieure dudit manchon cylindrique (17) de façon à raidir ladite première extrémité (44) desdits fils métalliques ou brins (11).

21. Boulon serre-câble (10) selon la revendication 1, dans lequel le boulon serre-câble (10) est adapté à être utilisé dans une excavation, la première extrémité (44) desdits fils métalliques ou brins (11) est adaptée à s'ajuster à l'intérieur d'un trou de sondage formé dans ladite excavation et la seconde extrémité est adaptée à s'appuyer contre la surface d'excavation, la région terminale de ladite seconde extrémité desdits fils métalliques ou brins (11) qui se termine dans ledit manchon cylindrique (17) ayant une surface externe filetée adaptée à coopérer avec ledit écrou de blocage fileté (18) pour bloquer ledit boulon serre-câble (10) contre ladite excavation.

22. Boulon serre-câble (10) selon la revendication 13, quand elle est dépendante de la revendication 7, dans lequel ledit moyen d'accouplement a une portion externe filetée et adaptée à venir en prise avec un filetage interne dudit manchon cylindrique (17) de telle sorte que, par une telle venue en prise et une telle rotation dudit moyen d'accouplement, on atteint une position dudit moyen d'accouplement telle qu'une rotation supplémentaire a pour résultat une rotation dudit boulon serre-câble (10), ledit moyen d'accouplement ayant un raccordement pour recevoir un tube à coulis au ciment (26) et raccordant ledit tube à coulis au ciment (26) audit élément tubulaire (12) central, creux, de telle sorte que le coulis au ciment est pompé au travers dudit tube à coulis au ciment (26) et pénètre dans ledit élément tubulaire (12) central, creux.

23. Boulon serre-câble (10) selon la revendication 22, dans lequel coulis au ciment, après avoir rempli ledit élément tubulaire (12) central, creux, ledit coulis au ciment sort dudit élément et pénètre dans ledit trou de sondage.

Drawing